mineral

Tumbled milky quartz pebble

Quartz, silicon dioxide (SiO₂)

AI-generated identification · may be incorrect

Hardness 7 Mohs; white to cream, translucent to opaque, with a vitreous-to-waxy luster. It has a hexagonal crystal structure, but tumbling has rounded and obscured crystal faces; cleavage is absent and fracture is conchoidal.

Identified August 25, 2026More mineral →

Explore Tumbled milky quartz pebble in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Quartz formed when silica crystallized in igneous, metamorphic, or hydrothermal settings, commonly over millions to billions of years. This specimen was likely naturally water-worn or mechanically tumbled and polished.

Uses & applications

Used for glass, ceramics, abrasives, engineered stone, and electronics; attractive pieces are used in lapidary work and inexpensive jewelry.

Geological facts

Milky appearance results from microscopic fluid inclusions, fractures, or impurities scattering light. Quartz is one of Earth’s most abundant and chemically durable minerals.

Field identification & locations

Identify it by its glassy sheen, lack of cleavage, rounded fracture, hardness sufficient to scratch ordinary glass, and white translucent appearance. Common worldwide, especially in quartz veins, granitic terrains, and stream gravels.